Optical spectroscopy of young tidal objects around two interacting galaxy pairs. Issue 2 (31st July 2018)

• Record Type: Journal Article
• Authors: Lee-Waddell, K; Madrid, J P; Spekkens, K; Donzelli, C J; Koribalski, B S; Serra, P; Cannon, J
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 480:Issue 2(2018)
• Page Start: 2719
• Page End: 2725
• Publication Date: 2018-07-31
• Subjects: galaxies: dwarf -- galaxies: groups: individuals: NGC 3166/9 -- galaxies: groups: individual: NGC 4725/47 -- galaxies: interactions; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty2042
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: We present Gemini Multi-Object Spectrograph spectra of H i -rich tidal features located around the outskirts of two interacting galaxy pairs, NGC 3166/9 and NGC 4725/47. These follow-up observations are part of a multiwavelength campaign to study the properties and frequency of tidal dwarf galaxies (TDGs) in group environments. Based on the calculated gas-phase metallicity and redshift, in addition to the previously measured H i and stellar properties, we have confirmed the tidal origins of TDG candidate AGC 208457, which has emerged from the tidal debris of an interaction between the NGC 3166/9 galaxy pair. By comparing H i and optical recessional velocities, we have also confirmed a physical association of the gaseous knots and star clusters embedded in the metal-rich tidal tail of NGC 4747.